18.5.2动态代理和AOP

----此处是JDK动态代理----
package d18_5_2;

public interface IDog {
	void info();

	void run();
}

package d18_5_2;

public class GunDog implements IDog {

	@Override
	public void info() {
		System.out.println("DunDog 我是一只猎狗！");
	}

	@Override
	public void run() {
		System.out.println("GunDog 我奔跑迅速！");
	}

}

　　

package d18_5_2;

public class DogUtil {

	public void beforeMethod() {
		System.out.println("DogUtil beforeMethod");
	}

	public void afterMethod() {
		System.out.println("DogUtil afterMethod");
	}
}

　　

package d18_5_2;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

public class MyInvocationHandler implements InvocationHandler {
	// 需要被代理的对象
	private Object target;

	public void setTarget(Object target) {
		this.target = target;
	}

	@Override
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		DogUtil du = new DogUtil();
		du.beforeMethod();
		Object result = method.invoke(target, args);
		du.afterMethod();
		return result;
	}

}

　　

package d18_5_2;

import java.lang.reflect.Proxy;

public class MyProxyFactory {
	// 为指定target生成动态代理对象
	public static Object getProxy(Object target) {
		// 创建一个MyInvocationHandler对象
		MyInvocationHandler handler = new MyInvocationHandler();
		// 为MyInvocationhandler指定target
		handler.setTarget(target);
		return Proxy.newProxyInstance(target.getClass().getClassLoader(),
				target.getClass().getInterfaces(), handler);
	}
}

　　

package d18_5_2;

public class TestDog {

	public static void main(String[] args) {
		IDog target=new GunDog();
		IDog dog = (IDog)MyProxyFactory.getProxy(target);
		dog.info();
		dog.run();
	}

}